Nastenko A. Methods for assessing the resistance of symmetric block ciphers based on indicators of randomness

Thesis is devoted to the justification of the adequacy of the simulation block symmetric ciphers by scaling their algebraic structure for further assessing of resistance of ciphers to differential and linear cryptanalysis, using indicators of random permutations of corresponding degree. Scientific and technical challenge consists in getting arguments that the scaled models of block symmetric ciphers repeats indicators of randomness of their prototypes. The thesis represents a complex of research with small and full-scale cipher models, in particular, studies of differential and linear parameters, avalanche, correlation and statistical parameters of different block ciphers Research results confirm the adequacy of modelling symmetric block ciphers by scaling their algebraic structure. The results obtained are introduced into the learning process of the Kharkiv National University of Radioelectronics, as well as in the Private joint-stock company "Institute of Information Technologies."